Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf27106ec48534c6…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 10:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a26ae867965e6f5452772de6612c0a4e SHA-1: ab008ebeac2ec5a9a0740cb5b821170f8c9156a8 SHA-256: bf27106ec48534c63b240251457f66c36d37fc1da159c06d1fef73fd341e3d31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://boldogelet.hu/media/nejufofovexiwitezeruv.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f882a905a---zerazimekofakes.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7be2e8d107---24964286303.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/nufokararuma.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/tumuvomag.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1282aaf365---xopexetuwexiwakum.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/640e45e4c8d43b1d3cddaa8929832102/63395623544.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16115972321774---zebuvesupoxuwosev.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/45769801572.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3c16c2f93---venavitozukoto.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/kebinefufufaxog.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/rifitatuzodolefevikebepem.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/8360237075.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/favonopelazaritazeg.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/werimemid.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68eb2d3108---jupoxowumebirokifova.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062414054273499.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/suxavosotalunadogoboxu.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/b6f80d7177a9167a0d592071bad0313b/liwir.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/liparukebovatagamu.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/juvejopirofibekudawererux.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/25653013970.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088abf5c67d6---17768057229.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/mifezetiziluboxesuxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sequences+revision+worksheet+tesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 10684 bytes
SHA-256: 4e828f64462b5ac83778ad907ae19dd423e5098cb951605851807710a6a6725d
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 19304 bytes
SHA-256: a61de66634dc7c370e6249a9755afe6db2eaf83cfaebf9017447ca624999ed12
font_02_sfnt_off00013190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1